CN102299878B - Method and device for realizing multi-band digital predistortion (DPD) - Google Patents
Method and device for realizing multi-band digital predistortion (DPD)Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
- H—ELECTRICITY
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- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
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- H04B1/0475—Circuits with means for limiting noise, interference or distortion
- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
- H04L27/367—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion
- H04L27/368—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion adaptive predistortion
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- H03F2200/111—Indexing scheme relating to amplifiers the amplifier being a dual or triple band amplifier, e.g. 900 and 1800 MHz, e.g. switched or not switched, simultaneously or not
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/0425—Circuits with power amplifiers with linearisation using predistortion
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Abstract
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for implementing a multi-band DPD.
Background
With the high recognition of mobile operators at home and abroad, in recent large-scale commercial deployment, a network establishment mode of a Base Band Unit (BBU) + Radio Remote Unit (RRU) shows a trend of fundamentally changing a traditional network architecture. Due to the difference of spectrum policies of various countries and regions, spectrum resources obtained by global mobile operators are relatively dispersed, and the global mobile operators generally face the challenges of multiple systems and multiple frequency bands. Taking China Mobile as an example, 4 frequency bands of F (1880MHz-1920MHz), A (2010MHz-2025MHz), E (2320MHz-2370MHz) and D (2570MHz-2620MHz) are successively obtained in a TD-SCDMA system. In order to reduce the equipment cost and meet the requirements of a TD network for adapting to different frequency bands and application scenarios, there are over ten RRU products currently, and each RRU product is also called a narrowband RRU product for a fixed narrowband frequency band. However, even the mainstream manufacturers have difficulty to cover the whole frequency band by the current narrow-band RRU product, and in the future, once the frequency division mode is adjusted again, the existing narrow-band RRU product has to be replaced, which all promote the radio frequency of the RRU product to be developed to the wide-band direction as soon as possible.
After the realization of radio frequency broadband, the key technology is the realization of broadband power amplification. Under the traditional technology, when multi-band networking is realized, a multi-narrow-band RRU product is needed, the station building and maintenance are difficult, and the equipment is frequently replaced during capacity expansion, which is not beneficial to reducing the equipment cost. The broadband RRU product based on the broadband power amplifier technology can greatly reduce the requirement of the system on the number of the RRU products, and is beneficial to realizing the long-term stable development of the network; meanwhile, compared with a narrow-band RRU product adopting the traditional technology, the weight and the volume of the broadband RRU product are greatly reduced along with the increase of the number of frequency bands, so that the rapid implementation of engineering is facilitated; compared with the RRU product which simply combines the power amplifiers corresponding to a plurality of frequency bands under the traditional technology, the broadband RRU product has the advantages of reduced electronic components, improved reliability and reduced power consumption.
For wideband RRU products, a wideband DPD (Digital PreDistortion) technology supporting multiple frequency bands is one of the core technologies for developing wideband RRU products. In the prior art, if DPD of multiple frequency bands (e.g., 3 frequency bands or more) is to be implemented, only multiple single-frequency-band DPD systems can be directly combined, which results in large equipment volume, low efficiency, high cost of broadband RRU products, and non-compliance with the requirements of technical evolution; in addition, in the process of directly combining the single-frequency-band DPD systems, mutual interference between the single-frequency-band DPD systems is not considered, and therefore, the DPD processing result cannot accurately reflect the real performance of the combined DPD systems, which is not beneficial to the application of the subsequent wideband power amplifier.
Disclosure of Invention
The embodiment of the invention provides a method and a device for realizing multi-band digital predistortion, which are used for enabling a processing result of the digital predistortion to truly reflect the real performance of a multi-band combination after power amplification, and further improving the application performance of a subsequent broadband power amplifier.
A method for implementing multi-band DPD comprises the following steps:
receiving at least two paths of input signals respectively positioned at different working frequency bands;
respectively determining a DPD coefficient corresponding to a currently received input signal on each working frequency band; the DPD coefficient corresponding to the currently received input signal in any working frequency band is obtained according to the feedback signal of each input signal received last time in each working frequency band and the input signal received last time in any working frequency band;
according to the currently received input signal and the corresponding DPD coefficient thereof on each working frequency band and the currently received input signal on the interference frequency band of each working frequency band, the DPD output signal corresponding to the currently received input signal on each working frequency band is respectively obtained, wherein the interference frequency band of any working frequency band means other working frequency bands except the any working frequency band.
An apparatus for implementing a multi-band DPD, comprising:
the interface module is used for receiving at least two paths of input signals respectively positioned at different working frequency bands;
the DPD processing module is used for respectively determining a DPD coefficient corresponding to the currently received input signal on each working frequency band; the DPD coefficient corresponding to the currently received input signal in any working frequency band is obtained according to the feedback signal of each input signal received last time in each working frequency band and the input signal received last time in any working frequency band; and respectively obtaining a DPD output signal corresponding to the currently received input signal on each working frequency band according to the currently received input signal and the corresponding DPD coefficient thereof on each working frequency band and the currently received input signal on the interference frequency band of each working frequency band, wherein the interference frequency band of any working frequency band means other working frequency bands except the any working frequency band.
An RRU comprising any of the above apparatus.
In the embodiment of the invention, aiming at input signals received on a plurality of working frequency bands, a new DPD mathematical model is designed, which is characterized in that when DPD processing is carried out on the input signals received on any working frequency band, a DPD coefficient generated based on feedback signals of input signals received last time on the working frequency band and other working frequency bands is required to be referred, and simultaneously the input signals currently received by other working frequency bands are referred, namely, intermodulation influence among the input signals received on each working frequency band is considered in the DPD processing flow, so that the DPD processing result can compensate intermodulation characteristics of multi-band signal combination after passing through PA, the accuracy of the DPD processing result is improved, the ACLR (Adjacent Channel Leakage power Ratio) performance after broadband power amplification is further improved, and the same signal processing device can be applied to a wider frequency domain range, the method is also applicable to the change of the frequency band division mode, thereby effectively reducing the production cost of the signal processing device and reducing the execution complexity of the DPD processing flow.
Drawings
FIG. 1 is a functional block diagram of a signal processing apparatus according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating DPD processing for input signals received over multiple operating bands according to an embodiment of the present invention.
Detailed Description
In the multi-band data signal processing flow, in order to enable the processing result of digital predistortion to compensate the intermodulation characteristic of a multi-band signal combination after passing through a PA, and further improve the ACLR performance of a subsequent broadband power amplifier, in the embodiment of the invention, after receiving at least two input signals respectively positioned at different working frequency bands, when carrying out DPD processing on the currently received input signal at any working frequency band, a processing device needs to refer to the currently received input signal at an interference frequency band and feedback signals of the previously received input signals at the working frequency band and the interference frequency band, namely, the mutual influence among the input signals of each path is considered, so that the DPD processing result can truly reflect the real system performance after the multi-band combination.
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, in the embodiment of the present invention, the signal processing apparatus includes an interface module 20 and a DRD processing module 21,
the interface module 20 is configured to receive at least two input signals respectively located at different operating frequency bands;
a DPD processing module 21, configured to determine a DPD coefficient corresponding to a currently received input signal in each operating frequency band respectively; the DPD coefficient corresponding to the currently received input signal in any working frequency band is obtained according to the feedback signal of each input signal received last time in each working frequency band and the input signal received last time in any working frequency band; and respectively obtaining the DPD output signal corresponding to the currently received input signal on each working frequency band according to the currently received input signal and the corresponding DPD coefficient on each working frequency band and the currently received input signal on the interference frequency band of each working frequency band.
Further, a DRD training module 22 may be further disposed in the signal processing apparatus, and is configured to configure a DPD coefficient, and specific functions of the DPD training module 22 will be described in subsequent embodiments and will not be described herein again.
Fig. 1 is only a preferred example of the signal processing apparatus, and is not described herein again.
On the other hand, in the embodiment of the present invention, the signal processing apparatus may be a certain functional module inside the RRU, or may be an independently operating apparatus connected to the RRU, which is not described herein again.
Based on the above technical solution, in the embodiment of the present invention, a new DPD mathematical model is designed, and the signal processing apparatus can perform DPD processing on the received input signals of multiple frequency bands by using the DPD mathematical model, as shown in fig. 2, the specific process is as follows:
step 200: at least two paths of input signals respectively positioned at different working frequency bands are received.
In practical applications, the multiple input signals located in different operating frequency bands may have: the F1 signal and the F2 signal, the FX signal are shown in fig. 1, and in this embodiment, only three signals, i.e., an F1 signal, an F2 signal, and an FX signal, are taken as an example for description, where F1, F2, and FX respectively represent the operating frequency bands in which the input signals are located.
Preferably, the F1 signal, the F2 signal and the FX signal received by the signal receiving apparatus may be baseband signals subjected to peak-to-average ratio suppression, for example, as shown in fig. 1, the F1 signal, the F2 signal and the FX signal are respectively subjected to CFR (peak Factor Reduction) processing in an F1-CFR sub-module, an F2-CFR sub-module and an FX-CFR sub-module of the receiving module 20, and then enter a subsequent processing stage.
Step 210: respectively determining a DPD coefficient corresponding to a currently received input signal on each working frequency band; the DPD coefficient corresponding to the currently received input signal in any operating frequency band is obtained according to the feedback signal of each input signal received last time in each operating frequency band and the input signal received last time in any operating frequency band.
Instep 210, the previous reception may be the last reception, or the last reception, because it is not necessary to adjust the DPD coefficients corresponding to the input signals received last and last time for each operating band every time the feedback signals of the input signals on each operating band are received, and if the system performance is relatively stable, it is likely that the DPD coefficients used in the DPD processing for the input signals on any operating band for several consecutive times are the same when the input signals on each operating band are received for several consecutive times.
On the other hand, in the signal processing process, when the DPD training module 22 in the signal processing apparatus configures a DPD coefficient corresponding to a currently received input signal in any operating frequency band according to a feedback signal of each input signal received in the previous time in each operating frequency band and a previously received input signal in the previous time in the any operating frequency band, the DPD training method includes:
step A: and determining the input signal received last time in any one of the working frequency bands.
And B: determining a feedback signal of an input signal received last time in any one of the operating frequency bands;
and C: and determining feedback signals of all paths of input signals received at the last time on the interference frequency band of any one working frequency band, wherein the interference frequency band refers to other working frequency bands except the any working frequency band.
For example, when DPD coefficients are configured for the input signal received at F1, F1 is the operating band, and F2 and FX are the interference bands; when DPD coefficients are configured for the input signal received at F2, F2 is the operating band and F1, FX are the interference bands; when DPD coefficients are configured for the input signal received at FX, FX is the operating band and F1, F2 are the interference bands.
Step D: and calculating a DPD coefficient corresponding to the currently received input signal in any working frequency band according to the previously received input signal and the feedback signal thereof in any working frequency band, the previously received feedback signal of each path of input signal in the interference frequency band of any working frequency band, and a preset weighting coefficient.
Preferably, when D is executed, the correlation operation can be performed by using formula one:
formula one
Wherein,
k represents a preset nonlinear order;
q represents a preset memory depth;
n represents the sampling point serial number;
m represents a preset parameter, and the value of the preset parameter is an even number;
z′r(n) represents an input signal previously received at any one of the operating frequency bands;
for example, referring to FIG. 1, z'1(n)、z′2(n) and z'x(n) may be considered as the input signal previously received at the operating bands F1, F2, FX, respectively;
y′f(n-q) a feedback signal representing an input signal previously received at any one of the operating frequency bands;
for example, referring to FIG. 1, the input signal z 'received last time in the operating band F1'1(n) after being processed by DPD processing module 21, its DPD output signal is returned to DPD training module 22 via RF-TX (radio frequency transmit channel) - > MPA (wideband Power Amplifier) - > RF-FB (radio frequency feedback channel), and is transmitted to F1-DPD-T sub-module, F2-DPD-T sub-module, and FX-DPD-T sub-module, respectively, within DPD training module 22 for calculating DPD coefficients of the currently received input signal at F1, DPD coefficients of the currently received input signal at F2, and DPD coefficients of the currently received input signal at FX, respectively, wherein z's ' when calculating DPD coefficients of the input signal received at F1 '1(n) the corresponding feedback signal is used as the feedback signal for the currently received input signal at the operating band, and z 'is used when calculating the DPD coefficients for the input signals received at F2 and FX, respectively'1(n) the corresponding feedback signal is used as a feedback signal for the currently received input signal on the interference frequency band; similarly, the input signal z 'received last time in the working frequency band F2'2(n) and the previously received input signal z 'in the operating frequency band FX'x(n) operation mode and z'1(n) are the same and will not be described in detail herein.
y′s(n-q) represents the feedback signal of the input signal received last time in S interference frequency bands, and in the embodiment of the present invention, an application scenario where S > 2 is taken as an example for description.
For example, y 'when the DPD coefficients of the input signal received at F1 are configured's(n-q) represents the feedback signal of the input signal received on F2 and FX, S being the number of interference bins.
ak，qOne of K DPD coefficients representing a memory depth of q has a value range of: a is0，q～aK-1，q(ii) a When the memory depth is q, the input signal on any one working frequency band corresponds to K DPD coefficients;
bk，mand representing a preset weighting coefficient, wherein the weighting coefficient is used for representing the degree of mutual influence between the input signal received last time on the working frequency band and the input signal received last time on the interference frequency band, and is configured in advance by a manager according to experience.
Z'r(n)，y′f(n-q) and y's(n-q) is known, and any DPD coefficient ak，qCan be derived from the above equation one.
Step 220: and respectively obtaining a DPD output signal corresponding to each path of input signal according to each path of currently received input signal, a DPD coefficient corresponding to each path of input signal and an interference signal corresponding to each path of input signal.
In the process of executingstep 220, when the signal processing apparatus respectively obtains the DPD output signals corresponding to the currently received input signals in any operating frequency band according to the currently received input signals in any operating frequency band and the corresponding DPD coefficients thereof, and the currently received input signals in the interference frequency band in any operating frequency band, the method includes:
step O: an input signal currently received at any of the above operating frequency bands is determined.
Step P: determining each path of currently received input signals on the interference frequency band of any one working frequency band; the interference frequency band is also an operating frequency band other than any one of the operating frequency bands.
Step Q: and obtaining a DPD output signal corresponding to the input signal currently received in any one of the operating frequency bands according to the input signal currently received in any one of the operating frequency bands and the corresponding DPD coefficient thereof, each input signal currently received in the interference frequency band of any one of the operating frequency bands, and a preset weighting coefficient.
Preferably, when executing Q, the correlation operation can be performed by using the formula two:
formula two
Wherein,
k represents a preset nonlinear order;
q represents a preset memory depth;
n represents the sampling point serial number;
m represents a preset parameter, and the value of the preset parameter is an even number;
zr(n) indicates a DPD output signal corresponding to a currently received input signal at any one operating band;
for example, referring to FIG. 1, z1(n)、z2(n) and zx(n) may be considered as DPD output signals for the currently received input signals at operating bands F1, F2, FX, respectively;
yf(n-q) represents the currently received input signal at any one of the operating frequency bands;
for example, referring to fig. 1, after the currently received input signal at the operating frequency band F1 is transmitted to the DPD processing module 21 for processing, are respectively transmitted to the F1-DPD sub-module, the F2-DPD sub-module and the FX-DPD sub-module in the DPD processing module 21, for calculating the DPD output signals corresponding to the input signals currently received at F1 respectively, the DPD output signal corresponding to the input signal currently received at F2 and the DPD output signal corresponding to the input signal currently received at FX, wherein, when calculating the DPD output signal corresponding to the currently received input signal at F1, the currently received input signal at F1 is used as the currently received input signal at the operating frequency band, while the currently received input signal corresponds to the DPD output signal in calculating F2 and FX respectively, the currently received input signal at F1 is used as the currently received input signal at the interference band; similarly, the operation manner of the currently received input signal in the operating band F2 and the previously received input signal in the operating band FX is the same as that of the currently received input signal in the operating band F1, and therefore, the detailed description thereof is omitted.
ys(n-q) represents the currently received input signal in S interference frequency bands, and in the embodiment of the present invention, an application scenario where S > 2 is taken as an example for description.
E.g. y when the currently received input signal corresponds to the DPD output signal at F1s(n-q) represents the input signal currently received at F2 and FX, S being the number of interference bins.
ak，qOne of K DPD coefficients representing a memory depth of q has a value range of: a is0，q～aK-1，q(ii) a When the memory depth is q, the input signal on any one working frequency band corresponds to K DPD coefficients;
bk，mand representing a preset weighting coefficient, wherein the weighting coefficient is used for representing the degree of mutual influence between the input signal received last time on the working frequency band and the input signal received last time on the interference frequency band, and is configured in advance by a manager according to experience.
At K DPD coefficients, yf(n-q) and ys(n-q) is known, the DPD output signal z corresponding to the currently received input signal in any operating frequency bandr(n) are allCan be derived by the above equation two.
Based on the above embodiment, after obtaining the DPD output signals corresponding to the currently received input signals in each operating band, each DPD output signal is processed by RF-TX and MPA and then transmitted, and a corresponding feedback signal is obtained through RF-FB for calculating the DPD coefficients corresponding to the subsequently received input signals in each operating band, that is, after obtaining the DPD output signals corresponding to the currently received input signals in any operating band, the signal processing apparatus needs to feed the DPD output signals back to the DPD training module 22 through RF-TX- > MPA- > RF-FB, that is, the corresponding feedback signals are respectively transmitted to the F1-DPD-T sub-module, the F2-DPD-T sub-module and the DPD-FX-T sub-module in the DPD training module 22 for calculating the DPD coefficients corresponding to the subsequently received input signals in each operating band, for example, the signal processing means will z1(n) after RF-TX- > MPA- > RF-FB processing, the corresponding feedback signals are respectively transmitted to the F1-DPD-T sub-module, the F2-DPD-T sub-module and the FX-DPD-T sub-module in the DPD training module 22 for obtaining DPD coefficients corresponding to the input signals subsequently received at F1, F2 and FX, and z is z when calculating the DPD coefficients corresponding to the input signals subsequently received at F11The feedback signal of (n) is used as the feedback signal of the input signal received last time in the operating band, and z is used to obtain the DPD coefficients corresponding to the input signals received next time in F2 and FX1The feedback signal of (n) is used as a feedback signal of the input signal received last time in the interference frequency band, and the specific operation is referred to formula one, which is not described herein again. Similarly, the DPD output signal z in the operating band F22(n) and DPD output signal z at operating frequency band FXx(n) method of subsequent treatment and z1(n) are the same, and are not described herein again.
Referring to fig. 1, when the signal processing device processes DPD output signals corresponding to currently received DPD input signals of each operating frequency band through RF-TX, the RF-TX may combine each DPD output signal in a digital domain, perform digital-to-analog conversion on the combined DPD output signals by using a uniform DAC (digital-to-analog converter), and finally transmit the DPD output signals to a broadband power amplifier for transmission; or, the RF-TX may also perform digital-to-analog conversion on each path of DPD output signal by using a corresponding DAC, perform digital domain combining on each converted path of DPD output signal, and transmit the DPD output signal to a broadband power amplifier for transmission.
After the combined radio frequency signal enters MPA, the output signal is coupled to RF-RX, the RF-RX employs a plurality of broadband radio frequency filters, the feedback signals on each working frequency band are respectively filtered out by switching the radio frequency switch in a time-sharing manner, then, the RF-RX can down-convert the feedback signals on each working frequency band and directly output the down-converted feedback signals to the DPD training module 22 through a unified ADC (analog-to-digital converter) for calculating the DPD coefficients corresponding to the subsequently received input signals on each working frequency band, or the feedback signals on each working frequency band can be directly down-converted and then output broadband signals through the corresponding ADC, and then the broadband signals on each working frequency band are subjected to spectrum shifting and digital filtering in the digital domain and then sent to the DPD training module 22 for calculating the DPD coefficients corresponding to the subsequently received input signals on each working frequency band.
In summary, in the embodiments of the present invention, a new DPD mathematical model is designed for input signals received in multiple operating bands, and is characterized in that when DPD processing is performed for input signals received in any operating band, a DPD coefficient generated based on feedback signals of input signals received last time in the operating band and other operating bands is required to be referred to, and simultaneously, input signals currently received in other operating bands (i.e., interference bands) are referred to, that is, intermodulation influence between input signals received in each operating band is considered in the DPD processing flow, so that data after DPD processing can compensate intermodulation influence of multiband signals passing through the PA in advance, thereby improving ACLR performance of signals passing through the PA. For example, for the application scenario shown in fig. 1, if the existing DPD processing procedure is adopted, an MPA needs to be set for each DPD output signal on F1, F2, and FX, and if the DPD processing procedure described in the embodiment of the present invention is adopted, only one MPA needs to be set for each DPD output signal on F1, F2, and FX because intermodulation influence among input signals on F1, F2, and FX is considered, that is, each DPD output signal on F1, F2, and FX can be sent through the same MPA after being combined, so that the same signal processing apparatus can be applied to a wider frequency domain range, and even if the frequency band division manner is changed, the production cost of the signal processing apparatus is effectively reduced, and the execution complexity of the DPD processing procedure is also reduced.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (13)
1. A method for implementing DPD (digital Pre-distortion) of multi-band data is characterized by comprising the following steps:
receiving at least two paths of input signals respectively positioned at different working frequency bands;
respectively determining a DPD coefficient corresponding to a currently received input signal on each working frequency band; the DPD coefficient corresponding to the currently received input signal in any working frequency band is obtained according to the feedback signal of each input signal received last time in each working frequency band and the input signal received last time in any working frequency band;
according to the currently received input signal and the corresponding DPD coefficient thereof on each working frequency band and the currently received input signal on the interference frequency band of each working frequency band, the DPD output signal corresponding to the currently received input signal on each working frequency band is respectively obtained, wherein the interference frequency band of any working frequency band means other working frequency bands except the any working frequency band.
2. The method of claim 1, wherein configuring DPD coefficients corresponding to input signals currently received in any operating band according to feedback signals of input signals previously received in each operating band and input signals previously received in any operating band comprises:
determining an input signal received last time on any one working frequency band;
determining a feedback signal of an input signal received last time on any one working frequency band;
determining feedback signals of all paths of input signals received at the last time on an interference frequency band of any one working frequency band, wherein the interference frequency band is other working frequency bands except the any one working frequency band;
and calculating a DPD coefficient corresponding to the currently received input signal on any working frequency band according to the previously received input signal and the feedback signal thereof on any working frequency band, the previously received feedback signal of each path of input signal on the interference frequency band of any working frequency band, and a preset weighting coefficient.
3. The method according to claim 1 or 2, wherein obtaining the DPD output signal corresponding to the currently received input signal in any operating band according to the currently received input signal in any operating band and its corresponding DPD coefficient, and the currently received input signal in the interference band in any operating band respectively comprises:
determining an input signal currently received at said any operating frequency band;
determining each path of currently received input signals on the interference frequency band of any one working frequency band; the interference frequency band is other working frequency bands except the any working frequency band;
and according to the currently received input signal and the corresponding DPD coefficient thereof on any working frequency band, each path of currently received input signal on the interference frequency band of any working frequency band and a preset weighting coefficient, obtaining a DPD output signal corresponding to the currently received input signal on any working frequency band.
4. The method of claim 3, wherein after obtaining the DPD output signals corresponding to the currently received input signals on each operating frequency band, each DPD output signal is transmitted after being processed by a radio frequency transmission channel and a broadband power amplifier, and a corresponding feedback signal is obtained through a radio frequency feedback channel for calculating the DPD coefficients corresponding to the subsequently received input signals on each operating frequency band.
5. The method of claim 4, wherein sending each DPD output signal after being processed by a radio frequency transmission channel and a broadband power amplifier comprises:
sending each DPD output signal to a radio frequency transmitting channel, combining each DPD output signal in a digital domain by the radio frequency transmitting channel, performing digital-to-analog conversion on the combined DPD output signal by adopting a uniform digital-to-analog converter, and transmitting the converted DPD output signal to a broadband power amplifier for sending; or,
and sending each DPD output signal to a radio frequency transmitting channel, performing digital-to-analog conversion on each DPD output signal by the radio frequency transmitting channel through a corresponding digital-to-analog converter, performing digital domain combination on each converted DPD output signal, and transmitting the combined signals to a broadband power amplifier for sending.
6. The method of claim 4, wherein the obtaining the corresponding feedback signal through the rf feedback channel for calculating the DPD coefficients corresponding to input signals subsequently received at the operating frequency bands comprises:
coupling an output signal sent by the broadband power amplifier to the radio frequency feedback channel, wherein the radio frequency feedback channel adopts a plurality of broadband radio frequency filters to respectively filter out feedback signals on each working frequency band;
the radio frequency feedback channel carries out analog-to-digital conversion on the feedback signals on each working frequency band after down-conversion through a unified analog-to-digital converter, and calculates the DPD coefficients corresponding to subsequently received input signals on each working frequency band according to the converted feedback signals on each working frequency band; or, the radio frequency feedback channel down-converts the feedback signals on each working frequency band, then performs analog-to-digital conversion through the corresponding analog-to-digital converter, performs frequency spectrum shifting and digital filtering processing on the converted feedback signals on each working frequency band, and calculates the DPD coefficients corresponding to subsequently received input signals on each working frequency band according to the processed feedback signals on each working frequency band.
7. An apparatus for implementing pre-distortion (DPD) of multi-band data, comprising:
the interface module is used for receiving at least two paths of input signals respectively positioned at different working frequency bands;
the DPD processing module is used for respectively determining a DPD coefficient corresponding to the currently received input signal on each working frequency band; the DPD coefficient corresponding to the currently received input signal in any working frequency band is obtained according to the feedback signal of each input signal received last time in each working frequency band and the input signal received last time in any working frequency band; and respectively obtaining a DPD output signal corresponding to the currently received input signal on each working frequency band according to the currently received input signal and the corresponding DPD coefficient thereof on each working frequency band and the currently received input signal on the interference frequency band of each working frequency band, wherein the interference frequency band of any working frequency band means other working frequency bands except the any working frequency band.
8. The apparatus of claim 7, further comprising:
a DPD training module, configured to configure a DPD coefficient, where the DPD training module determines an input signal received last time in any operating band, a feedback signal of the input signal received last time in any operating band, and a feedback signal of each input signal received last time in an interference band of any operating band when configuring a DPD coefficient corresponding to the input signal currently received in any operating band, where the interference band is other operating bands except for the any operating band, and according to the input signal received last time in any operating band and its feedback signal, the feedback signal of each input signal received last time in the interference band of any operating band, and a preset weighting coefficient, which is used for calculating a DPD coefficient corresponding to the currently received input signal on any working frequency band.
9. The apparatus according to claim 7 or 8, wherein the DPD processing module determines the currently received input signal in any working band and each input signal currently received in the interference band of any working band when obtaining the DPD output signal corresponding to the currently received input signal in any working band according to the currently received input signal in any working band and its corresponding DPD coefficient, and the currently received input signal in the interference band of any working band, where the interference band is other than the any working band, and each input signal currently received in the interference band of any working band according to the currently received input signal in any working band and its corresponding DPD coefficient, and a preset weighting coefficient, obtaining a DPD output signal corresponding to the currently received input signal on the any working frequency band.
10. The apparatus of claim 9, wherein the DPD processing module obtains DPD output signals corresponding to currently received input signals in each operating band, and then sends the DPD output signals after processing the DPD output signals through a radio frequency transmission channel and a broadband power amplifier, so that the DPD training module obtains corresponding feedback signals through a radio frequency feedback channel to calculate DPD coefficients corresponding to subsequently received input signals in each operating band.
11. The apparatus of claim 10, wherein the DPD processing module sends the DPD output signals after they are processed through rf transmission channels and broadband power amplifiers, including:
sending each DPD output signal to a radio frequency transmitting channel, combining each DPD output signal in a digital domain by the radio frequency transmitting channel, performing digital-to-analog conversion on the combined DPD output signal by adopting a uniform digital-to-analog converter, and transmitting the converted DPD output signal to a broadband power amplifier for sending; or,
and sending each DPD output signal to a radio frequency transmitting channel, performing digital-to-analog conversion on each DPD output signal by the radio frequency transmitting channel through a corresponding digital-to-analog converter, performing digital domain combination on each converted DPD output signal, and transmitting the combined signals to a broadband power amplifier for sending.
12. The apparatus of claim 10, wherein the DPD training module obtains a corresponding feedback signal through a radio frequency feedback channel for calculating DPD coefficients corresponding to input signals subsequently received in the operating frequency bands, and includes:
the broadband power amplifier couples the transmitted output signal to the radio frequency feedback channel, and the radio frequency feedback channel adopts a plurality of broadband radio frequency filters to respectively filter out feedback signals on each working frequency band;
the radio frequency feedback channel carries out analog-to-digital conversion on the feedback signals on each working frequency band after down-conversion through a unified analog-to-digital converter, and the DPD training module calculates the DPD coefficients corresponding to subsequently received input signals on each working frequency band according to the converted feedback signals on each working frequency band; or, the radio frequency feedback channel down-converts the feedback signals on each working frequency band, then performs analog-to-digital conversion through the corresponding analog-to-digital converter, and performs spectrum shifting and digital filtering processing on the converted feedback signals on each working frequency band, and the DPD training module calculates the DPD coefficients corresponding to subsequently received input signals on each working frequency band according to the processed feedback signals on each working frequency band.
13. A radio remote unit comprising a device as claimed in any one of claims 7 to 12.
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| CN201110262027.4ACN102299878B (en) | 2011-09-06 | 2011-09-06 | Method and device for realizing multi-band digital predistortion (DPD) |
| EP12829525.0AEP2755358B1 (en) | 2011-09-06 | 2012-09-06 | Method and device for acquiring multi-frequency band digital predistortion output signals |
| PCT/CN2012/081058WO2013034086A1 (en) | 2011-09-06 | 2012-09-06 | Method and device for acquiring multi-frequency band digital predistortion output signals |
| US14/241,084US9025698B2 (en) | 2011-09-06 | 2012-09-06 | Method and device for acquiring multi-frequency band digital predistortion output signals |
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| CN103023842B (en)* | 2012-11-26 | 2016-08-24 | 大唐移动通信设备有限公司 | A kind of Multiband pre-distortion factor lookup table update method and system |
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| EP2755358A4 (en) | 2014-07-30 |
| CN102299878A (en) | 2011-12-28 |
| US9025698B2 (en) | 2015-05-05 |
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